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Income Taxes - Summary of Major Components of Deferred Income Tax (Recovery) Expense from Continuing Operations (Detail) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Major components of tax expense (income) [abstract] |  |  |
Unrecognized tax losses and temporary differences |  | $ 2.7 | $ 0.4
Origination and reversal of timing differences |  | (1.9) | 16.3
Recovery arising from previously unrecognized tax assets |  | (0.2) | (1.6)
Change of tax rates |  | (0.1) | 0.6
Revaluation due to US tax reform | $ 10.0 |  | (12.6)
Disposition of a subsidiary |  |  | (29.5)
Total deferred income tax expense (recovery) |  | $ 0.5 | $ (26.4)

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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deferred tax expense or income relating to tax rate changes or the imposition of new taxes. [Refer: Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce current tax expense. [Refer: Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce deferred tax expense. [Refer: Deferred tax expense (income); Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Deferred tax expense income relating to disposition of subsidiary. + References No definition available. + Details
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- Definition Deferred tax expense income relating to transition tax related to tax reform. + References No definition available. + Details
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